[Well Id have to say the jackshaft gears and clutching. Even though fun factor, the 16 front end is much better. The 14 jackshaft is a weak link. Im sure there are many that havent had an issue, but I snapped mine at 1000 miles. Upgrading to the 15 shaft was cheap and easy. About $100. 16 jackshaft is even better but havent heard of anyone snapping a 15 shaft yet. The chain on the 14 is weak and the bottom aluminum gear wears bad and quick. Failure potential is there. I broke a silent chain link at 500 miles. Luckily caught it with maintenance before it failed completely. Team has a nice bw hyvo chain and team steel gear setup for $200. Try 20/49. Although 19/50 does work and clutch temps stay lower. Last the stock primary spring is junk. Too high engagement and sacks out quick causing loss of rpm. Go with a speederx h5 alloy spring. Much better metal used and higher tensile strength over your standard chrome silicon spring. I used 120/310 in my 14. Gonna try a 114/285 in my 16 cause the clutches are different. Also buy some metal thunder products glide washers and put one under the primary spring in the cover. I tried one on both ends but one is enough to eliminate spring bind and not raise clutch engagement too much. $65 total for clutching. Stock weights work well enough IMO. Total of $365 or so